(function(win,doc){
		//浏览器缩放时
		win.onresize=function(){
			change();
		};
		change();
		function change(){
			var oFs=doc.documentElement.clientWidth/(320/20);

			//设置根目录字体大小
			doc.documentElement.style.fontSize=oFs+'px';
		}
	})(window,document);
